The CMR-PC Series of On/Off Photocell sensors provide the industrys most intelligent control of lighting for daylight harvesting applications. Ideal for public spaces with windows like vestibules, corridors, or bathrooms; the sensors work by monitoring daylight conditions in a room, then controlling the lighting so as to insure that adequate lighting levels are maintained. The CMR-PC has On/Off lighting control; turning off the lights when sufficient daylight is present and turning them on when additional lighting is necessary. The CMR-PC Series sensors are line powered and can switch loads directly without the need for a Power Pack. The CMR-PCs enclosure is designed to mount to the ceiling. Low temperature -40 to 160F.